body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
}

nav {
    background-color: #333;
    padding: 10px;
    margin-bottom: 20px;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

.alert {
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 4px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

form div {
    margin-bottom: 15px;
}